From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: "Pali Rohár" <pali@kernel.org>
Cc: "Andrew Lunn" <andrew@lunn.ch>,
"Heiner Kallweit" <hkallweit1@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
"Jakub Kicinski" <kuba@kernel.org>,
"Marek Behún" <kabel@kernel.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/4] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips
Date: Wed, 30 Dec 2020 16:10:37 +0000 [thread overview]
Message-ID: <20201230161036.GR1551@shell.armlinux.org.uk> (raw)
In-Reply-To: <20201230154755.14746-2-pali@kernel.org>
On Wed, Dec 30, 2020 at 04:47:52PM +0100, Pali Rohár wrote:
> Workaround for GPON SFP modules based on VSOL V2801F brand was added in
> commit 0d035bed2a4a ("net: sfp: VSOL V2801F / CarlitoxxPro CPGOS03-0490
> v2.0 workaround"). But it works only for ids explicitly added to the list.
> As there are more rebraded VSOL V2801F modules and OEM vendors are putting
> into vendor name random strings we cannot build workaround based on ids.
>
> Moreover issue which that commit tried to workaround is generic not only to
> VSOL based modules, but rather to all GPON modules based on Realtek RTL8672
> and RTL9601C chips.
>
> They can be found for example in following GPON modules:
> * V-SOL V2801F
> * C-Data FD511GX-RM0
> * OPTON GP801R
> * BAUDCOM BD-1234-SFM
> * CPGOS03-0490 v2.0
> * Ubiquiti U-Fiber Instant
> * EXOT EGS1
>
> Those Realtek chips have broken EEPROM emulator which for N-byte read
> operation returns just one byte of EEPROM data followed by N-1 zeros.
>
> So introduce a new function sfp_id_needs_byte_io() which detects SFP
> modules with these Realtek chips which have broken EEPROM emulator based on
> N-1 zeros and switch to 1 byte EEPROM reading operation which workaround
> this issue.
>
> This patch fixes reading EEPROM content from SFP modules based on Realtek
> RTL8672 and RTL9601C chips.
>
> Fixes: 0d035bed2a4a ("net: sfp: VSOL V2801F / CarlitoxxPro CPGOS03-0490 v2.0 workaround")
> Co-developed-by: Russell King <rmk+kernel@armlinux.org.uk>
> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
> Signed-off-by: Pali Rohár <pali@kernel.org>
> ---
> drivers/net/phy/sfp.c | 78 ++++++++++++++++++++++++-------------------
> 1 file changed, 44 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
> index 91d74c1a920a..490e78a72dd6 100644
> --- a/drivers/net/phy/sfp.c
> +++ b/drivers/net/phy/sfp.c
> @@ -336,19 +336,11 @@ static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
> size_t len)
> {
> struct i2c_msg msgs[2];
> - size_t block_size;
> + u8 bus_addr = a2 ? 0x51 : 0x50;
> + size_t block_size = sfp->i2c_block_size;
> size_t this_len;
> - u8 bus_addr;
> int ret;
>
> - if (a2) {
> - block_size = 16;
> - bus_addr = 0x51;
> - } else {
> - block_size = sfp->i2c_block_size;
> - bus_addr = 0x50;
> - }
> -
NAK. You are undoing something that is definitely needed. The
diagnostics must be read with sequential reads to be able to properly
read the 16-bit values.
The rest of the patch is fine; it's a shame the entire thing has
been spoilt by this extra addition that was not in the patch we had
been discussing off-list.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
next prev parent reply other threads:[~2020-12-30 16:11 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-30 15:47 [PATCH 0/4] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber Pali Rohár
2020-12-30 15:47 ` [PATCH 1/4] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips Pali Rohár
2020-12-30 16:10 ` Russell King - ARM Linux admin [this message]
2020-12-30 16:56 ` Pali Rohár
2020-12-30 17:05 ` Russell King - ARM Linux admin
2020-12-30 17:13 ` Andrew Lunn
2020-12-30 17:43 ` Pali Rohár
2020-12-30 19:09 ` Russell King - ARM Linux admin
2020-12-30 19:49 ` Andrew Lunn
2020-12-31 12:14 ` Pali Rohár
2020-12-31 15:09 ` Andrew Lunn
2020-12-31 15:40 ` Pali Rohár
2020-12-31 15:30 ` Andrew Lunn
2020-12-31 17:00 ` Pali Rohár
2020-12-31 17:13 ` Andrew Lunn
2021-01-02 1:49 ` Pali Rohár
2021-01-03 2:25 ` Thomas Schreiber
2021-01-03 2:41 ` Pali Rohár
2021-01-06 14:55 ` Pali Rohár
2021-01-06 15:21 ` Russell King - ARM Linux admin
2021-01-06 15:23 ` Russell King - ARM Linux admin
2021-01-06 15:27 ` Russell King - ARM Linux admin
2021-01-06 15:35 ` Pali Rohár
2020-12-30 19:30 ` Andrew Lunn
2020-12-30 19:39 ` Russell King - ARM Linux admin
2020-12-30 17:31 ` Pali Rohár
2020-12-30 19:18 ` Russell King - ARM Linux admin
2020-12-30 15:47 ` [PATCH 2/4] net: sfp: allow to use also SFP modules which are detected as SFF Pali Rohár
2020-12-30 16:11 ` Russell King - ARM Linux admin
2020-12-30 17:06 ` Pali Rohár
2020-12-30 17:27 ` Marek Behún
2020-12-30 19:12 ` Russell King - ARM Linux admin
2020-12-31 13:52 ` Pali Rohár
2020-12-30 15:47 ` [PATCH 3/4] net: sfp: assume that LOS is not implemented if both LOS normal and inverted is set Pali Rohár
2020-12-30 16:13 ` Russell King - ARM Linux admin
2020-12-30 16:57 ` Pali Rohár
2020-12-30 17:06 ` Russell King - ARM Linux admin
2020-12-30 17:17 ` Andrew Lunn
2020-12-30 17:32 ` Pali Rohár
2020-12-30 15:47 ` [PATCH 4/4] net: sfp: add mode quirk for GPON module Ubiquiti U-Fiber Instant Pali Rohár
2021-01-06 15:37 ` [PATCH v2 0/3] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber Pali Rohár
2021-01-06 15:37 ` [PATCH v2 1/3] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips Pali Rohár
2021-01-07 2:02 ` Andrew Lunn
2021-01-07 9:08 ` Pali Rohár
2021-01-07 17:19 ` Andrew Lunn
2021-01-07 17:40 ` Russell King - ARM Linux admin
2021-01-07 19:18 ` Pali Rohár
2021-01-07 19:17 ` Pali Rohár
2021-01-07 19:45 ` Russell King - ARM Linux admin
2021-01-07 20:21 ` Marek Behún
2021-01-08 0:49 ` Pali Rohár
2021-01-06 15:37 ` [PATCH v2 2/3] net: sfp: assume that LOS is not implemented if both LOS normal and inverted is set Pali Rohár
2021-01-07 16:54 ` Andrew Lunn
2021-01-09 15:46 ` Russell King - ARM Linux admin
2021-01-09 15:54 ` Andrew Lunn
2021-01-09 16:27 ` Russell King - ARM Linux admin
2021-01-09 19:14 ` Pali Rohár
2021-01-09 23:19 ` Russell King - ARM Linux admin
2021-01-09 23:50 ` Pali Rohár
2021-01-06 15:37 ` [PATCH v2 3/3] net: sfp: add mode quirk for GPON module Ubiquiti U-Fiber Instant Pali Rohár
2021-01-07 16:51 ` Andrew Lunn
2021-01-11 11:39 ` [PATCH v3 0/2] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber Pali Rohár
2021-01-11 11:39 ` [PATCH v3 1/2] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips Pali Rohár
2021-01-11 15:28 ` Marek Behún
2021-01-11 11:39 ` [PATCH v3 2/2] net: sfp: add mode quirk for GPON module Ubiquiti U-Fiber Instant Pali Rohár
2021-01-11 15:32 ` Marek Behún
2021-01-12 13:33 ` [PATCH v3 0/2] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber Pali Rohár
2021-01-18 9:34 ` Pali Rohár
2021-01-25 14:09 ` Pali Rohár
2021-01-25 14:16 ` Russell King - ARM Linux admin
2021-01-25 14:23 ` Pali Rohár
2021-01-25 14:42 ` Russell King - ARM Linux admin
2021-01-25 14:47 ` Pali Rohár
2021-01-25 15:41 ` Andrew Lunn
2021-01-25 15:02 ` [PATCH v4 " Pali Rohár
2021-01-25 15:02 ` [PATCH v4 1/2] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips Pali Rohár
2021-01-25 15:02 ` [PATCH v4 2/2] net: sfp: add mode quirk for GPON module Ubiquiti U-Fiber Instant Pali Rohár
2021-01-28 21:50 ` [PATCH v4 0/2] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber patchwork-bot+netdevbpf
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